Tea-Rex, you still have one of those things? I haven't seen one of those since I sold it in 1972.

Ground speed is calculated by dropping a bouhyied line and timing how many knots you've tied into the line at 6 fathom intervals transverse through your hands during a sandglass timed interval of 3 minutes. This is a modern feature added as an extra on new Catalinas, Beneteaus and Hunters. All the rest of us (particularly at my age) don't really care how fast we're going, just that we're still going

IIRC, using a chip knot log... will tell you the boat speed relative to the water, but not the speed over ground, since it doesn't account for whatever current set and drift may be occurring at the time.

Quote:

Originally Posted by ianhlnd

Ground speed is calculated by dropping a bouhyied line and timing how many knots you've tied into the line at 6 fathom intervals transverse through your hands during a sandglass timed interval of 3 minutes. This is a modern feature added as an extra on new Catalinas, Beneteaus and Hunters. All the rest of us (particularly at my age) don't really care how fast we're going, just that we're still going

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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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IIRC, using a chip knot log... will tell you the boat speed relative to the water, but not the speed over ground, since it doesn't account for whatever current set and drift may be occurring at the time.

So whats your point? It's not going to make any difference, you'll get there when you get there

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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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Plotting frequent positions on the chart, ascertained by the most reliable methods available, is the best method of determining set and drift. It is a navigational axiom that one should do upon the chart as much as possible. Using formulas and calculations one is apt to make the dreaded math error. Plotting on the chart is much less error prone as each conclusion must "look right". Besides, doing all that math, when a simple fix will do, keeps one too long in the chart room and not on watch where one belongs.

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